As a rule of thumb means it's like not necessarily the most reliable rule that is always the case in every situation. It's just a general rule that it will apply in most cases. And I think it comes from the idea of like when you're trying to measure something. In my case, it's about an inch across and you use your thumb to measure the thing. Right? That's the rule of thumb. It's about it's about 12 inches, right? You know, as a rule of thumbs. No. These are the most important words. Thumb, flea. Yeah. The thumb. Yes, exactly. As arule of thumb. Okay. Mm